The opus number of a work means its order of publishing. Most composers that published music used the opus system.Most composers were selective about which works they allowed to be published, only releasing their best works for sale. While was there a financial incentive behind this, it also tended to indicate that a composer considered such a work to be truly important.Music published after a composer's death are titled opus posthumous, which is usually shortened to 'Opp'.

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Published by musicologist Dr. Kern Holoman in 1987, this catalog is the first thematic catalog of Berlioz's works to be compiled. Its full title reads 'Catalogue of the Works of Hector Berlioz, New Berlioz Edition vol. 25' (Kassel, etc.: Bärenreiter, 1987).